C3 instances are ideal for applications that benefit from a higher amount of compute capacity relative to memory, and are recommended for high performance web servers, and other scale-out compute-intensive applications. C3 instances are available in five sizes – c3.large, c3.xlarge, c3.2xlarge, c3.4xlarge, c3.8xlarge.

You can purchase G2 and C3 instances as On-Demand Instances, Reserved Instances, or as Spot Instances. To learn more about G2 and C3 instances, please visit the Amazon EC2 Instance Types page.